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  • 1
    Electronic Resource
    Electronic Resource
    Fabrication and characterization of modulation-doped-field-effect-transistors with antidot-patterned passivation layers (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1924-1926 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A gate passivation technique for modulation-doped-field-effect-transistors has been proposed and demonstrated. This technique incorporates an antidot-patterned (net-shaped), polymer passivation layer deposited between the gate metal and the heterojunction wafer. Characterization results of the device with the patterned passivation layer show that independent engineering of the threshold voltage and the transconductance has been achieved. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117623
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  • 2
    Electronic Resource
    Electronic Resource
    Age-hardening associated with grain boundary precipitation in a commercial dental gold alloy (1999)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 26 (1999), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The aim of this study was to make clear the age-hardening mechanism in a dental high carat gold alloy. For this purpose, age-hardening behaviour of a commercial dental high carat gold alloy, 65·5wt% Au–14·0wt% Ag–10·0wt% Cu–8·9wt% Pt, was investigated by means of hardness testing, X-ray diffraction study and scanning electron microscopy. Age-hardening was generated by the coherency strain resulting from the transformation of the α single phase to the Ag-rich α1 phase and the AuCu I type ordered phase. The coherency strain seemed to be associated with the nucleation of the AuCu ordered structure initially, and then was brought about with the simultaneous formation of the Ag-rich α1 phase and the AuCu I type ordered phase. Hardening was attributed mainly to the very fine coherent precipitates of a lamellar structure composed of the Ag-rich α1 phase and the AuCu I type ordered phase at grain boundaries, and softening, which occurred following prolonged ageing, was due to the coarsening of the fine lamellar structure by releasing the strain at the interfaces of the adjacent lamellae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.1999.00371.x
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  • 3
    Electronic Resource
    Electronic Resource
    High-level expression of an endoxylanase gene from Bacillus sp. in Bacillus subtilis DB104 for the production of xylobiose from xylan (1998)
    Springer
    Applied microbiology and biotechnology 50 (1998), S. 113-118 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract To produce xylobiose from xylan, high-level expression of an endoxylanase gene from Bacillus sp. was carried out in Bacillus subtilis DB104. A 1.62-kb SmaI DNA fragment, coding for an endoxylanase of Bacillus sp., was ligated into the Escherichia coli/B. subtilis shuttle vector pJH27Δ88, producing pJHKJ4, which was subsequently transformed into B. subtilis DB104. A maximum endoxylanase activity of 105 U/ml was obtained from the supernatant of B. subtilis DB104 harboring pJHKJ4. The endoxylanase was purified to homogeneity by ion-exchange chromatography and the production profile of xylooligosaccharides from xylan by the endoxylanase was examined by HPLC with a carbohydrate analysis column. Xylobiose was the major product from xylan at 40 °C and its proportion in the xylan hydrolyzates increased with the reaction time; at 12 h, over 60% of the reaction products was xylobiose. These results suggest that xylobiose, which has a stimulatory effect on the selective growth of the intestinal bacterium Bifidobacterium, can be mass-produced effectively by the endoxylanase of Bacillus sp. cloned in B. subtilis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051264
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of sudden changes in salinity on endogenous rhythms of the spotted sea bass Lateolabrax sp. (1998)
    Springer
    Marine biology 131 (1998), S. 219-225 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The endogenous rhythm of oxygen consumption in juvenile spotted sea bass (Lateolabrax sp.) was measured to test the effects of sudden changes in salinity on the metabolic activity. Mean oxygen consumption rates of this euryhaline fish decreased by 13.5 to 16.0% and 25.3 to 36.4% when they were transferred from 31.5 to 15‰ seawater and to fresh water (0‰), respectively. The maximum rate of oxygen consumption was observed between 18:00 and 19:00 hrs local time, 1 to 2 h before sunset, even though they were kept in constant darkness. The peaks of oxygen consumption occurred in 23.2- and 23.3-h intervals, which correspond with a circadian rhythm, as revealed by maximum entropy spectral analysis. A markedly weakened rhythm in oxygen consumption occurred from 8 to 10 d after onset of the experiments. This study indicates that spotted sea bass can withstand sudden drops in salinity from 31.5‰ to fresh water, and yet maintain a regular though somewhat dampened endogenous rhythm of oxygen consumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050314
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  • 5
    Electronic Resource
    Electronic Resource
    Liquid Thermal Conductivity of Binary Mixtures of Pentafluoroethane (R125) and 1,1,1,2-Tetrafluoroethane (R134a) (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 55-62 
    Details
    ISSN: 1572-9567
    Keywords: mixture ; R125 ; R134a ; R125+R134a ; refrigerant ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Thermal conductivities of zeotropic mixtures of R125 (CF3CHF2) and R134a (CF3CH2F) in the liquid phase are reported. Thermal conductivities have been measured by a transient hot-wire method with one bare platinum wire. Measurements have been carried out in the temperature range of 233 to 323 K and in the pressure range of 2 to 20 MPa. The dependence of thermal conductivity on temperature, pressure, and composition of the binary mixture is presented. Measured thermal conductivity data are correlated as a function of temperature, pressure, and overall composition of the mixture. The uncertainty of our measurements was estimated to be better than 2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021469928377
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of swelling soil on a moving retaining wall (1995)
    Springer
    Soil mechanics and foundation engineering 32 (1995), S. 163-166 
    Details
    ISSN: 1573-9279
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Abstract A procedure is proposed for determining the effect of the displacement of a retaining wall on the stress-strain state of the mass swelling soil adjacent to it and the lateral pressure acting on it using the finite-element method. The results of calculations performed in accordance with the method in question and data derived from a field experiment are compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02336298
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  • 7
    Electronic Resource
    Electronic Resource
    Zonenmethode zur Berechnung ebener K&örperumstr&ömungen mit Totwasser und Bodeneinfluβ (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 270-278 
    Details
    ISSN: 1432-0681
    Keywords: Key words Flow separation ; dead water ; road influence ; flow modelling ; three-zones-calculation-method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Übersicht  Es wird ein Drei-Zonen-Verfahren zur Berechnung ebener Körperumströmungen mit Totwasser und Bodeneinfluβ vorgestellt. Hierzu wird das Strömungsfeld in drei Zonen, die reibungsfreie Auβenströmung, die am Körper anliegende Grenzschichtströmung und das Totwassergebiet aufgeteilt. Die reibungsfreie Auβenströmung wird mit einem Panelverfahren, die laminare und turbulente Grenzschichtströmung mit Hilfe eines mehrparametrigen Integralverfahrens berechnet. Das Totwassergebiet wird als fiktiver geschlossener Körper aufgefaβt, dessen Kontur mit Hilfe eines inversen Panelverfahrens iterativ bestimmt wird. Die einzelnen Zonen werden iterativ angepaβt. Beispielrechnungen für Tragflügel- und PKW-Umströmungen zeigen gute Übereinstimmungen mit Meβergebnissen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00805466
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  • 8
    Electronic Resource
    Electronic Resource
    Zonenmethode zur Berechnung ebener Körperumströmungen mit Totwasser und Bodeneinfluß (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 270-278 
    Details
    ISSN: 1432-0681
    Keywords: Flow separation ; dead water ; road influence ; flow modelling ; three-zones-calculation-method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Übersicht Es wird ein Drei-Zonen-Verfahren zur Berechnung ebener Körperumströmungen mit Totwasser und Bodeneinfluß vorgestellt. Hierzu wird das Strömungsfeld in drei Zonen, die reibungsfreie Außenströmung, die am Körper anliegende Grenzschichtströmung und das Totwassergebiet aufgeteilt. Die reibungsfreie Außenströmung wird mit einem Panelverfahren, die laminare und turbulente Grenzschichtströmung mit Hilfe eines mehrparametrigen Integralverfahrens berechnet. Das Totwassergebiet wird als fiktiver geschlossener Körper aufgefaßt, dessen Kontur mit Hilfe eines inversen Panelverfahrens iterativ bestimmt wird. Die einzelnen Zonen werden iterativ angepaßt. Beispielrechnungen für Tragflügel- und PKW-Umströmungen zeigen gute Übereinstimmungen mit Meßergebnissen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00805466
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  • 9
    Electronic Resource
    Electronic Resource
    The Brevibacterium albidum gene encoding the arginine tRNACCG complements the growth defect of an Escherichia coli strain carrying a thermosensitive mutation in the rnpA gene at the nonpermissive temperature (1997)
    Springer
    Molecular genetics and genomics 254 (1997), S. 464-468 
    Details
    ISSN: 1617-4623
    Keywords: Key words Brevibacterium albidum  ;  Arginine tRNACCG  ;  Escherichia colirnpA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Escherichia colirnpA gene encodes C5 protein, the protein component of RNase P. The rnpA49 mutation renders the C5 protein thermosensitive, which results in thermosensitivity of RNase P function. The chromosomal DNA region from Brevibacterium albidum that complements the rnpA49 mutation was analysed. The gene capable of complementing the growth defect of an rnpA49 mutant strain at nonpermissive temperature was identified as the gene for an arginine tRNA with anticodon CCG by a deletion analysis combined with complementation assays. Transcription of the arginine tRNA gene carried on a multicopy plasmid was correlated with the complementation of the rnpA49 mutation, indicating that the gene product is indeed responsible for complementation of the rnpA49 mutation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380050440
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of surfactants on ethanol fermentation using glucose and cellulosic hydrolyzates (1996)
    Springer
    Biotechnology letters 18 (1996), S. 299-304 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The effect of the non-ionic surfactants on the ethanol fermentation was greatly dependent on the surfactant added. While Tween 20 and Tween 80 slightly enhanced ethanol fermentation, Triton X-100 which exhibited the inghest increase in the enzymatic saccharification had a negative effect on the ethanol fermentation. The negative effect of Triton X-100 on ethanol production was the most pronounced when the cellulosic hydrolyzates were used. Tween 80 showed the best performance for the ethanol production from steam exploded wood hydrolyzate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00142948
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